Potato Variety Trials 2004

Eric P. Eldredge, Clinton C. Shock, and Lamont D. Saunders

Malheur Experiment Station

Oregon State University

Ontario, OR

Introduction

New potato varieties were evaluated for their productivity and usefulness for processing. Potatoes are grown under contract in Malheur County, Oregon for potato processors to produce frozen products for the food service industry. There is very little production for fresh pack or open market, and very few growers have potato storage buildings on their farms. There is also no production of varieties for making potato chips. Potato seed is not produced in Malheur County because high populations of aphids result in virus infection in the tubers.

The varieties grown for processing are mainly 'Ranger Russet', 'Shepody', and 'Russet Burbank'. Harvest begins in July, and potatoes go to processing plants directly from the field. Yields are limited by "early die" syndrome, which causes early senescence of the vines. Early die is caused by a complex of soil pathogens, including bacteria, nematodes, and fungi, and is worse when crop rotations between potato crops are short.

Small acreages of new varieties or advanced selections are sometimes contracted to study the feasibility of expanding their use. To displace an existing processing variety, a new potato variety needs to have several outstanding characteristics. The yield should be at least as high as the yield of Russet Burbank. The tubers need to have low reducing sugars for light, uniform fry color, and high specific gravity. A new variety should be resistant to tuber defects or deformities caused by disease, water stress, or heat. It should begin tuber bulking early if it is a variety for early harvest. Or, if it is a late-harvest variety, it should be resistant to early die.

Potato variety development trials at Malheur Experiment Station (MES) in 2004 included the Western Regional Early Harvest Trial with 20 entries, the Western Regional Late Harvest Trial with 20 entries, the Oregon Statewide Trial with 29 entries, the Oregon Preliminary Yield Trial with 131 entries, a Malheur Preliminary Yield Trial of 6 strains selected in previous 8-Hill trials at MES, and an 8-Hill trial of 84 clones from the USDA Agricultural Research Service (ARS) potato breeding program at Aberdeen, Idaho. Through these trials and active cooperation with other scientists in Idaho, Oregon, and Washington, promising new lines are bred, evaluated, and eventually released as new varieties.

Materials and Methods

Six potato variety trials were grown under sprinkler irrigation on Owyhee silt loam, where winter wheat was the previous crop in a potato, wheat, corn, wheat, potato rotation. The wheat stubble was flailed and the field was irrigated and disked. A soil test taken on September 16, 2003 showed 37 lb nitrogen (N)/acre in the top 2 ft of soil, and 102 lb available phosphate (P2O5), 851 lb soluble potash (K2O), 29 lb sulfate (SO4), 1966 ppm calcium (Ca), 463 ppm magnesium (Mg), 87 ppm sodium (Na), 1.6 ppm zinc (Zn), 18 ppm iron (Fe), 4 ppm manganese (Mn), 0.7 ppm copper (Cu), 0.5 ppm boron (B), organic matter 3.5 percent, and pH 7.4 in the top foot of soil. Fall fertilizer was spread to apply 60 lb N/acre, 50 lb P2O5/acre, 80 lb K2O/acre, 57 lb sulfur (S)/acre, 8 lb Zn/acre, 5 lb Cu/acre, and 1 lb B/acre. The field was ripped, Telone II® soil fumigant was injected at 25 gal/acre, and the field was bedded on 36-inch row spacing.

Seed of all varieties was hand cut into 2-oz seed pieces and treated with Tops-MZ®+ Gaucho® dust one to two weeks before planting and placed in storage to suberize. On March 22, 2004, the field was cultivated with a Lilliston rolling cultivator to reshape the hills and to control winter annual weeds and volunteer wheat. On April 2 a soil sample was taken that showed 43 lb N/acre in the top 2 ft of soil, 83 lb available P2O5, 688 lb soluble K2O, 26 lb SO4, 1,835 ppm Ca, 353 ppm Mg, 69 ppm Na, 1.1 ppm Zn, 5 ppm Fe, 1 ppm Mn, 0.4 ppm Cu, 1.2 ppm B, pH 7.4, and 3.0 percent organic matter in the top foot of soil.

Potato seed pieces were planted in single-row plots using a 2-row cup planter with 9-inch seed spacing in 36-inch rows. Red potatoes were planted at the end of each plot as markers to separate the potato plots at harvest. After planting, hills were formed over the rows with the Lilliston rolling cultivator. Prowl® at 1 lb/acre plus Dual® at 2 lb/acre herbicide was applied as a tank mix for weed control on May 7 and was incorporated with the Lilliston. Matrix® herbicide was applied at 1.25 oz/acre on May 17 and was incorporated with 0.41 inch of rain on the next day, followed by 0.89 inch of additional rain through the end of May.

The Western Regional Early Harvest Trial was planted on April 13, 2004. The Western Regional Late Harvest and the 8-Hill Trial were planted on April 19. The Statewide Trial and the Preliminary Yield Trials were planted on April 26. The Malheur Preliminary Yield Trial, planted on April 26, consisted of 2 entries with sufficient seed available to plant 4 replicates of 30 seed pieces, and 4 entries with enough seed available to plant 2 replicates of 20 seed pieces. The 8-Hill trial was unreplicated with plots 8 seed pieces long, the Oregon Preliminary Yield Trial had 2 replicates with plots 20 seed pieces long, and the Statewide, Western Regional Early Harvest, and Western Regional Late Harvest Trials each had 4 replicates with plots 30 seed pieces long.

Irrigation was applied 21 times (Fig. 1), from June 4 to August 30, with scheduling based on soil water potential. The average readings of 6 Watermark soil moisture sensors (model 200 SS, Irrometer Co. Inc., Riverside, CA) were monitored every 8 hours by a Hansen model AM400 datalogger (M. K. Hansen Co., East Wenatchee, WA). Sensors were installed in the potato row at the seedpiece depth, 10 inches from the top of the hill. The AM400 unit was read frequently through the summer to predict crop water needs; the objective was to apply an irrigation just before the average soil moisture in the potato root zone at the seedpiece depth reached -60 kPa (Fig. 2). Water applied was estimated by recording the sprinkler set duration at 55 psi, and using the nominal sprinkler head output. Crop evapotranspiration (ETc) was estimated by the U.S. Bureau of Reclamation based on data from an AgriMet weather station at MES.

Fungicide applications to control early blight and prevent late blight infection started with an aerial application of Ridomil Gold® and Bravo® at 1.5 pint/acre on June 12. On June 25, Headline® fungicide was applied; on July 17, Topsin-M® fungicide plus liquid sulfur with 1.5 lb P2O5/acre and 0.2 lb Zn/acre was applied by aerial applicator. On August 8, Headline plus 6 lb S/acre was applied to prevent two-spotted spider mite infestation and powdery mildew infection.

Petiole tests were taken every 2 weeks from June 14, and fertilizer was injected into the sprinkler line during irrigation to supply the crop nutrient needs. A total of 103 lb N/acre, 44 lb P2O5/acre, 140 lb K2O/acre, 100 lb SO4/acre, 0.3 lb Mn/acre, 5 lb Mg/acre, 0.1 lb Cu/acre, 0.1 lb Fe/acre, and 0.5 lb B/acre were applied.

Vines were flailed in the Western Regional Early Harvest Trial on August 16. Western Regional Early Harvest Trial potatoes were lifted August 27 with a two-row digger that laid the tubers back onto the soil in each row. Visual evaluations included observations of desirable traits, such as a high yield of large, smooth, uniformly shaped and sized, oblong to long, attractively russetted tubers, with shallow eyes evenly distributed over the tuber length. Notes were also made of tuber defects such as growth cracks, knobs, curved or irregularly shaped tubers, pointed ends, stem-end decay, stolons that remained attached, folded bud ends, rough skin due to excessive russetting, pigmented eyes, or any other defect, and a note to keep or discard the clone based on the overall appearance of the tubers.

Tubers were placed into burlap sacks and hauled to a barn where they were kept under tarps until grading. After grading, a 20-tuber sample from each plot in the Western Regional Early Harvest Trial was evaluated for tuber quality traits for processing. Specific gravity was measured using the weight-in-air, weight-in-water method. Ten tubers per plot were cut lengthwise and the center slices were fried for 3.5 min in 375°F soybean oil. Percent light reflectance was measured on the stem and bud ends of each slice using a Photovolt Reflectance Meter model 577 (Seradyn, Inc., Indianapolis, IN), with a green tristimulus filter, calibrated to read 0 percent light reflectance on the black standard cup and 73.6 percent light reflectance on the white porcelain standard plate.

The vines were flailed on the late harvest trials on September 21. The vines of most entries had died by the date of the last irrigation on August 30. Potatoes in the Western Regional Late Harvest Trial were dug on October 5. The 8-Hill Trial tubers and the potatoes in the Statewide Trial were dug on October 6-7, and the Preliminary Yield Trial tubers were dug on October 7-8. At each harvest, the potatoes in each plot were visually evaluated as described above. Tubers were graded and a 20-tuber sample from each plot was placed into storage. The storage was kept near 90 percent relative humidity and the temperature was gradually reduced to 45°F. Tubers were removed from storage November 19 through December 6 and evaluated for tuber quality traits, specific gravity, and fry color as described above. Data were analyzed with the General Linear Models analysis of variance procedure in NCSS (Number Cruncher Statistical Systems, Kaysville, UT) using the Fisher's Protected LSD means separation t-test at the 95 percent confidence level.

Results and Discussion

At the Malheur Experiment Station in 2004, spring weather was cool and wet, followed by a summer without the usual extreme heat. Dry weather prevented late blight from developing in 2004. No powdery mildew or mite problems were observed in the field. Compared to the 2003 potato trials at this location, overall yields were lower by about 17 percent, and specific gravity of the tubers was lower.

Precipitation during May 1 through September 30 was 2.55 inches, the crop evapotranspiration (ETc) for the late-harvest trials totaled 26.19 inches, and the trials received 22.15 inches of irrigation plus precipitation, or 84.6 percent of ETc (Fig. 1). The step increases in the irrigation plus rainfall curve show the 21 sprinkler irrigations applied during the growing season.

The trend of soil moisture during the growing season is shown in Figure 2. The data do not show the individual irrigations because the sensors did not always respond to an irrigation. The irrigation plus rainfall was less than ETc for the growing season, and the sensor data show that average root zone soil water potential became drier than -60 kPa at least four times during the growing season.

Soil water potential at the seedpiece depth was allowed to become drier than -60 kPa at the end of the growing season, after the vines died on the early maturing entries, by applying frequent sprinkler irrigations of short duration, as shown in Figure 1. This was necessary to avoid swollen lenticels and the associated possibility of rotting the tubers of the early entries, while continuing to apply a portion of the ETc requirement for the late maturing entries in shallow moisture increments.

Western Regional Early Harvest Trial

In the Western Regional Early Harvest Trial, among the highest in total yields were 'A92294-6', 'Shepody', 'AC93026-9Ru', 'A93157-6LS', and 'TC1675-1Ru' with total yield ranging from 473 to 546 cwt/acre (Table 1). Of those clones, only TC1675-1Ru had specific gravity above 1.080 g cm-3, a desirable level for processing. In production of marketable tubers for processing (the total of U.S. No.1 plus U.S. No. 2 grades), A92294-6, Shepody, AC93026-9Ru, A9305-10, TC1675-1Ru, and A93157-6LS with marketable yield from 423 to 499 cwt/acre were among the highest in marketable yield.

Western Regional Late Harvest Trial

The highest total yield In the Western Regional Late Harvest Trial was produced by A92294-6, with 658 cwt/acre, and it also produced the highest marketable yield, 632 cwt/acre (Table 2). Among the highest producers of U.S. No. 1 tubers, on a percentage basis, were 'AC92009-4Ru', 'ATX91137-1Ru', and 'AO96160-3', with ATX92230-1Ru, 'Russet Norkotah', and 'A95109-1', ranging from 84 to 94 percent. Among the highest total U.S. No. 1 tuber producers were ATX92230-1Ru, A93157-6LS, AO96160-3, A92294-6, A9305-10, 'A95074-6', and TC1675-1Ru, ranging from 377 to 437 cwt/acre. Shepody, A92294-6, and Russet Burbank produced significantly more U.S. No. 2 tubers than other clones in this trial. In this late-harvest trial, specific gravity of A93157-6LS, AC92009-4Ru, AO96160-3, Ranger Russet, A92294-6, A95074-6, and TC1675-1Ru were among the highest, and acceptable for processing into frozen potato products.

Oregon Statewide Trial

In the Oregon Statewide Trial, the six clones marked with an asterisk were retained by the variety selection committee (Table 3). The clone AO96160-3 will stay in the Statewide Trial and in the Western Regional Trial, 'AO96164-1' will advance to the Western Regional Trial, 'AO96141-3' and 'AO98133-2' will advance to the Western Regional Russet Early and Late Harvest Trials, and 'AO96162-1' and 'AO99099-3' will be maintained in the Statewide Trial in 2005. At this location in 2004, AO96160-3, AO96164-1, AO96141-3, AO98133-2, AO96162-1, and AO99099-3 produced among the highest total yields, with a high percentage of U.S. No. 1 tubers, good specific gravity for processing, and light fry colors with no sugar ends. Russet Burbank produced 102 cwt/acre U.S. No. 2 tubers, significantly more than any other entry, and had 30 percent sugar ends.

Oregon Preliminary Yield Trial

In the Preliminary Yield Trial, 126 numbered clones were compared to Russet Burbank, Ranger Russet, Shepody, Russet Norkotah, and 'Umatilla Russet' (Table 4). The Oregon potato variety selection committee kept 11 clones, based on their performance at Hermiston, Klamath Falls, Powell Butte, and Ontario, to advance to the Statewide Trial for 2005. The clones that were advanced were 'AO96305-3' , 'AO96365-2', 'AO96370-2', 'AO98123-2', 'AO98268-5', 'AO98282-5', 'AO98307-6', 'AO99065-2', 'AO99081-1', 'AO99108-5', and 'AO99111-9'. These clones yielded well across the four locations (Hermiston, Klamath Falls, and Powell Butte data are not shown in this report), had a low incidence of undesirable characteristics, had high percentage of U.S. No. 1 tubers, and if selected as promising clones for processing, had high specific gravity, light fry color, and resistance to developing sugar ends in response to stress.

Malheur Preliminary Trial

This was the first year of a Malheur Preliminary Trial, a cooperative project by the Malheur Agricultural Experiment Station and the USDA-ARS. Six clones from previous 8-Hill trials at Malheur were selected for their adaptation to the high early die pressure, heavy soil texture, and hot, dry climate of the Treasure Valley. These clones were compared to Russet Burbank, Ranger Russet, and Umatilla Russet (Table 5). The clones 'A98345-1', 'A91814-2', 'A96112-20', produced a high percentage of U.S. No. 1 tubers, had specific gravity above 1.080 g cm-3 (a level desirable for processing), and produced no sugar ends. The clones 'A99133-6' and 'A99123-1' each produced 5 percent sugar ends, and 'A96783-109LB', produced 15 percent sugar ends.

8-Hill Trial

Eight hills were grown of each of 84 clones selected for long, russet tubers from the Aberdeen ARS potato breeding program, including 17 clones with the LB suffix signifying that they were bred for resistance to late blight. The 84 clones were evaluated for tuber type, yield, grade, and processing quality (Table 6). Yield and grade data were examined for clones having total yield greater than 530 cwt/acre and U.S. No. 1 tubers at 93 percent or higher, without excessive U.S. No. 2, cull, or undersized (less than 4 oz) tubers. Twenty-six of the clones had high yields and produced a high percentage of U.S. No. 1 tubers. Samples of these clones were analyzed for processing quality. The clone 'COA00329-1' yielded a total of 695 cwt/acre, with 85 percent U.S. No. 1 tubers, specific gravity of 1.092 g cm-3, and an average fry strip light reflectance of 47.8 percent, which was acceptable for processing, with 0 percent sugar ends. The clone 'A00345-3LB' yielded 644 cwt/acre total, with 91 percent U.S. No. 1 grade, specific gravity 1.085 g cm-3, and fry strip light reflectance of 44.5 percent.

Figure 1. Crop evapotranspiration (ETc) and sprinkler irrigation applied (plus rain) to potato variety trials, Malheur Experiment Station, Oregon State University, Ontario, OR, 2004.

Figure 2. Soil moisture data for sprinkler-irrigated potato variety trials, Malheur Experiment Station, Oregon State University, Ontario, OR, 2004.



U.S. No. 1







Average


Variety

Total

yield

Percent

No. 1

Total

No. 1

>12

oz

6 - 12 oz 4 - 6

oz

U.S. No. 2 Marketable < 4

oz

Cull Length/

width

Specific

gravity

Fry color, light

reflectance

Sugar

ends


cwt/acre % ---------------------------------cwt/acre---------------------------------- ratio g cm-3 % %

Ranger Russet

431 74 325 113 182 30 76 401 18 8 2.1 1.075 49.9 0.0

Russet Burbank

446 49 228 24 162 42 128 356 34 52 2.3 1.063 45.1 5.0

Russet Norkotah

290 88 256 42 159 55 8 264 22 2 1.9 1.063 47.7 2.5

Shepody

499 54 268 90 141 38 189 457 19 19 1.7 1.072 52.5 0.0

A92030-5

314 90 281 154 104 23 15 296 10 5 1.8 1.077 55.1 0.0

A92294-6

546 74 402 144 221 36 98 499 40 5 2.2 1.076 56.4 0.0

A9304-3

435 84 366 232 118 16 45 411 13 12 2.2 1.080 55.5 0.0

A9305-10

496 81 400 267 113 19 47 447 14 21 2.0 1.070 53.4 0.0

A93157-6LS

480 85 406 185 186 35 17 423 36 16 1.9 1.074 47.6 0.0

A95074-6

454 81 369 101 214 55 28 397 50 5 1.8 1.076 52.2 0.0

A95109-1

383 92 354 155 174 24 8 362 12 1 1.9 1.068 51.8 0.0

AC92009-4Ru

367 95 348 140 177 31 3 352 15 0 2.0 1.078 55.1 0.0

AC93026-9Ru

496 68 337 140 160 37 121 457 35 2 2.2 1.072 53.8 0.0

AO96160-3

416 90 375 64 249 62 10 385 30 1 1.9 1.080 55.6 0.0

ATX91137-1Ru

440 90 396 166 203 27 16 413 21 0 1.8 1.065 49.6 0.0

ATX92230-1Ru

429 91 391 128 219 45 14 406 20 0 1.8 1.071 58.2 0.0

CO93001-11Ru

415 76 318 19 203 96 30 348 59 0 1.7 1.064 49.9 0.0

CO94035-15Ru

459 80 371 144 186 41 42 413 27 0 1.9 1.064 52.8 0.0

PA95A11-14

440 70 311 40 189 82 65 377 61 3 2.0 1.072 54.0 0.0

TC1675-1Ru

473 85 405 109 229 67 27 432 33 6 1.9 1.081 54.7 0.0

Mean

436 80 345 123 179 43 49 395 28 8 1.9 1.072 52.6 0

LSD (0.05)

85 8 80 69 53 20 32 83 10 32 0.2 0.005 3.2 NS

NS= Not significant.



U.S. No. 1







Average


Variety

Total

yield

Percent

No. 1

Total

No. 1

>12

oz

6 -12

oz

4 - 6

oz

U.S. No. 2 Marketable <4 oz Cull Length/ width Specific

gravity

Fry color, light

reflectance

Sugar

ends


cwt/acre % ---------------------------------cwt/acre----------------------------------- ratio g cm-3 % %

Ranger Russet

485 66 319 178 113 28 147 466 16 3 2.3 1.084 34.5 18

Russet Burbank

460 49 225 55 130 40 181 406 23 28 2.4 1.063 22.7 30

Russet Norkotah

313 84 265 97 119 49 21 286 27 0 1.7 1.063 21.6 7

Shepody

454 45 202 90 82 30 217 419 21 8 1.8 1.074 26.2 20

A92030-5

342 83 285 171 85 28 39 323 17 0 1.8 1.077 42.2 0

A92294-6

658 64 425 157 221 47 207 632 24 0 2.2 1.083 40.5 10

A9304-3

422 74 312 174 114 23 85 397 11 13 2.2 1.080 38.2 0

A9305-10

547 76 415 282 108 25 100 516 20 10 1.9 1.072 36.4 18

A93157-6LS

567 76 435 241 143 51 87 522 34 1 2.0 1.088 46.2 0

A95074-6

504 75 382 129 183 70 64 446 39 12 1.8 1.082 38.6 3

A95109-1

404 84 339 172 141 27 50 389 12 0 1.9 1.078 30.9 8

AC92009-4Ru

381 94 356 195 130 32 12 368 13 0 2.0 1.086 38.2 5

AC93026-9Ru

466 61 282 152 97 33 145 427 37 2 2.2 1.074 29.9 23

AO96160-3

497 88 434 137 206 91 29 463 34 0 1.9 1.086 43.6 0

ATX91137-1Ru

477 92 437 213 176 48 18 455 17 5 1.9 1.069 25.8 15

ATX92230-1Ru

413 87 358 120 171 67 29 386 26 0 1.9 1.073 41.0 0

CO93001-11Ru

373 78 292 40 161 91 36 328 46 0 1.7 1.065 31.2 10

CO94035-15Ru

459 73 344 151 151 42 80 423 27 0 1.8 1.071 33.7 13

PA95A11-14

427 71 299 61 140 98 76 374 51 0 2.1 1.070 29.8 23

TC1675-1Ru

457 83 377 123 182 71 36 412 38 5 1.8 1.081 37.5 0

Mean

455 75 339 147 143 49 83 422 27 4 2.0 1.076 34.0 10

LSD (0.05)

66 10 68 51 44 20 43 60 14 13 0.2 0.008 4.1 NS

NS = Not significant.



U.S. No. 1








Average


Variety

Total

yield

Percent

No. 1

Total >12

oz

6-12

oz

4-6

oz

U.S.

No. 2

Marketable <4 oz Cull Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends


cwt/acre % ------------------------------------cwt/acre----------------------------------- ratio g cm-3 % %

R. Burbank

389 60 234 29 139 66 102 336 45 8 2.2 1.060 29.4 30

Ranger R.

474 79 377 163 164 50 49 425 42 7 1.9 1.086 40.5 0

R. Norkotah

282 84 237 41 142 54 4 241 39 2 2.0 1.060 30.7 0

Umatilla R.

437 76 332 43 177 112 34 366 70 1 1.9 1.082 48.5 0

AO96160-3*

437 88 384 62 209 113 16 400 37 0 1.8 1.085 47.8 0

AO96164-1*

399 83 331 93 173 65 29 360 36 3 2.0 1.077 51.1 0

AO96141-3*

423 69 295 76 157 61 61 356 65 1 2.3 1.083 51.0 0

AO96205-3

497 83 412 176 188 48 55 467 24 6 2.2 1.086 47.0 0

AO98133-2*

398 96 380 238 117 25 9 389 9 0 1.7 1.093 48.0 0

AO98133-4

356 79 284 47 163 74 16 300 55 1 1.6 1.084 38.7 0

AO94006-4

381 91 347 104 183 59 4 351 28 3 1.9 1.069 27.7 3

AO94007-1

424 88 373 91 224 59 17 389 35 0 2.2 1.067 48.3 0

AO96047-2

308 84 258 10 130 118 2 259 49 0 1.5 1.088 42.1 0

AO96073-2

467 84 389 121 216 53 20 410 40 18 2.0 1.069 30.6 28

AO96162-1*

444 77 343 55 190 97 25 368 74 2 2.1 1.095 58.6 0

AO98114-6

469 72 338 50 194 94 31 369 88 12 2.2 1.083 41.8 10

AO98141-2

415 79 331 38 206 87 25 355 59 1 2.1 1.076 45.6 3

AO99002-4

332 90 297 89 159 50 5 302 29 1 1.9 1.072 40.4 0

AO99002-7

371 91 337 156 146 35 11 349 22 0 2.0 1.076 41.9 5

AO99024-8

456 79 364 33 211 119 6 370 85 1 1.6 1.094 54.2 0

AO99060-5

417 82 345 191 119 35 16 361 19 36 1.9 1.071 33.9 0

AO99099-3*

429 88 376 187 149 41 21 398 29 3 1.9 1.083 47.8 0

Umatilla 407

474 71 338 57 181 100 53 391 80 3 1.9 1.084 43.6 0

Umatilla 418

422 78 329 34 175 121 29 358 63 1 2.0 1.079 45.2 3

Umatilla 432

429 78 332 45 181 106 42 374 52 3 2.0 1.078 46.2 0

Umatilla 311

470 80 376 65 195 117 22 398 72 0 1.9 1.085 48.8 0

Norkotah 101

291 84 246 44 143 58 7 253 37 1 2.1 1.058 27.1 0

Norkotah 206

288 88 253 57 136 60 4 257 30 0 2.0 1.059 25.7 5

Norkotah 210

272 84 232 49 130 54 9 240 31 1 2.0 1.059 26.6 3

Mean

402 81 326 84 169 73 25 351 46 4.0 2.0 1.077 41.7 3

LSD (0.05)

64 7 64 47 39 27 25 70 18 10 0.1 0.007 3.8 8



U.S. No. 1







Average


Variety

Total

yield

Percent

No. 1

Total >12

oz

6 - 12

oz

4 - 6

oz

U.S.

No. 2

Marketable

<4

oz

Cull Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends


cwt/acre % ---------------------------------cwt/acre-------------------------------- ratio g cm-3 % %

R. Burbank

511 68 281 85 141 56 130 411 49 36 2.5 1.065 28.9 45

Ranger R.

500 93 391 117 182 92 22 413 73 3 2.1 1.087 40.7 0

Shepody

412 91 289 83 88 118 32 322 73 10 1.8 1.076 33.5 20

Norkotah R.

494 97 449 323 80 47 9 459 28 2 2.0 1.059 26.3 5

Umatilla R.

465 90 319 95 134 90 39 358 105 0 2.0 1.081 44.8 0

AO96305-3

386 99 339 88 188 64 2 341 44 0 2.4 1.080 44.3 0

AO96365-2

472 94 395 198 131 66 26 420 52 0 1.9 1.080 32.3 5

AO96370-2

542 91 444 200 156 88 45 488 40 7 1.8 1.080 42.3 0

AO98123-2

604 100 547 269 200 78 0 547 57 0 1.7 1.093 58.4 0

AO98268-5

468 96 433 263 132 39 20 453 15 0 2.0 1.082 50.5 0

AO98282-5

370 91 275 79 106 89 24 299 71 0 2.2 1.086 44.7 0

AO98307-6

538 99 480 238 164 78 8 487 44 0 2.3 1.098 52.1 0

AO99065-2

501 96 433 253 137 43 18 451 35 15 2.0 1.077 44.5 0

AO99081-1

370 99 334 240 69 24 6 340 17 13 2.0 1.087 51.7 0

AO99108-5

583 96 511 349 120 42 18 530 41 0 2.0 1.081 45.3 0

AO99111-9

698 97 615 350 199 66 21 636 59 3 2.1 1.091 53.6 0

Mean

427 96 355 150 143 63 15 371 512 2 1.9 1.078 40.4 6.1

LSD (0.05)

180 11 172 170 88 53 39 180 44 NS 0.3 0.015 12.1 22



U.S. No. 1







Average


Variety

Total

yield

Percent

No. 1

Total >12

oz

6 - 12

oz

4 - 6

oz

U.S.

No. 2

Marketable

<4

oz

Cull Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends


cwt/acre % ---------------------------------cwt/acre-------------------------------- ratio g cm-3 % %
Trial with 4 replications














R. Burbank

389 60 234 29 139 66 102 336 45 6 2.2 1.060 29.4 30

Ranger R.

474 79 377 163 164 50 49 425 42 7 1.9 1.086 40.5 0

R. Norkotah

282 84 237 41 142 54 4 241 39 2 2.0 1.060 30.7 0

Umatilla R.

437 76 332 43 177 112 34 366 70 0 1.9 1.082 48.5 0

Defender

407 79 325 91 172 62 36 361 46 0 1.7 1.089 42.1 3

Gemstar

437 94 413 258 128 26 11 424 11 0 1.7 1.076 52.6 0

A98345-1

506 68 335 154 117 63 112 446 55 1 1.8 1.086 42.9 0

A91814-2

622 85 527 55 285 188 18 546 74 2 1.1 1.087 50.3 0

Mean

444 78 347 104 165 78 46 393 48 2 1.8 1.078 42.1 4

LSD (0.05)

60 9 64 47 33 26 46 56 16 5 0.1 0.005 3.3 6
















Trial with 2 replications














R. Burbank

511 68 281 85 141 56 130 411 49 36 2.5 1.065 28.9 45

Ranger R.

500 93 391 117 182 92 22 413 73 3 2.1 1.087 40.7 0

Norkotah R.

494 97 449 323 80 47 9 459 28 2 2.0 1.059 26.3 5

Umatilla R.

465 90 319 95 134 90 39 358 105 0 2.0 1.081 44.8 0

A99133-6

411 99 369 255 80 35 6 375 36 0 1.9 1.084 43.9 0

A96112-20

440 99 370 95 178 98 4 374 66 0 2.1 1.091 52.4 0

A99123-1

360 100 284 31 160 93 0 284 76 0 1.8 1.077 47.8 5

A96783-109LB

529 98 432 121 202 109 7 438 90 0 1.5 1.091 43.1 0

Mean

430 96 357 151 143 64 15 373 52 2 1.9 1.078 40.6 6.1

LSD (0.05)

180 10 172 170 87 54 39 180 44 NS 0.3 0.015 12.2 22



U.S. No. 1







Average


Variety

Total

yield

Percent

No. 1

Total >12

oz

6 - 12

oz

4 - 6

oz

U.S.

No. 2

Marketable

<4

oz

Cull Length/

width

Specific

gravity

fry color, light

reflectance

Sugar

ends


cwt/acre % ---------------------------------cwt/acre-------------------------------- ratio g cm-3 % %

A99031-12

442 95 420 347 61 13 8 428 14 0 1.6 1.071 48.0 0

A0012-2

552 88 487 251 140 96 7 494 57 0 1.7 1.071 50.2 0

A0031-4

370 98 362 251 76 36 0 362 5 0 1.8 1.092 49.0 0

A0036-2

487 95 462 307 129 26 9 470 16 0 1.8 1.077 45.8 0

A0068-5

506 97 488 348 125 15 0 488 18 0 1.8 1.079 43.1 0

A00138-1

403 95 382 230 102 50 0 382 21 0 1.4 1.074 40.3 0

A00138-4

592 87 516 373 106 37 0 516 40 28 1.2 1.073 31.1 0

A99074-9

545 82 448 180 208 60 27 475 70 0 1.6 1.073 34.7 0

A99074-15

585 91 535 357 117 61 5 540 45 0 1.7 1.077 34.3 0

A99134-1

329 99 326 268 50 8 0 326 3 0 2.1 1.079 43.1 0

A97257-3

380 96 365 194 141 30 5 370 10 0 1.6 1.070 38.3 0

A97320-1

487 95 465 287 101 76 0 465 22 0 1.7 1.074 35.9 0

A97322-1

430 97 416 344 65 8 11 428 2 0 2.0 1.070 36.0 0

COA00295-1

533 88 467 348 75 45 0 467 40 0 1.6 1.088 39.5 10

COA00329-1

695 85 591 218 232 142 50 641 54 0 1.8 1.092 47.8 0

COA00369-4

659 93 616 229 261 125 3 619 40 0 1.9 1.064 34.0 0

TXA00011-1

381 95 361 298 63 0 0 361 20 0 2.0 1.074 21.2 0

A00324-1

590 88 522 182 297 42 21 542 48 0 1.9 1.070 26.5 0

A00345-3LB

644 91 588 347 121 119 2 590 49 0 1.6 1.085 44.5 0

A00382-3LB

552 80 444 81 232 131 14 457 94 0 1.9 1.067 19.8 10

A00487-22LB

690 81 560 124 323 113 8 568 122 0 1.7 1.076 37.8 10

A00487-29LB

563 78 440 108 201 130 0 440 123 0 1.4 1.082 24.6 10

A00538-52LB

574 74 424 59 220 144 12 436 138 0 1.7 1.079 39.6 0

A00551-50LB

536 93 500 308 124 68 0 500 36 0 1.8 1.071 40.9 10

A00718-3

671 81 544 130 326 88 33 577 94 0 1.5 1.071 46.1 0

A00645-1

581 89 518 358 106 54 40 558 23 0 1.9 1.065 28.4 10

Overall Mean

451 83 375 174 129 72 19 394 54 2 1.7 1.075 37.7 2